"The most important thing in empirical work is to be clear about the question you are trying to answer."

书籍是最安静、最恒久的朋友；它们是最易接近、最明智的顾问，也是最耐心的老师。

The trend is your friend.

The method of psychology must be strictly controlled.

出自汉·桓宽《盐铁论·刺赋》。释义：冰和炭不能放在同一个容器之中，太阳和月亮也不会同时照耀大地。比喻君子与小人不能同处，或比喻相互矛盾的理论不能同时运用。